您不能在具有相同键的字典中包含多个项.您应该做的是将值设置为list.像这样-

You can't have multiple items in a dictionary with the same key. What you should do is make the value a list. Like this -

d = dict()
d["flow"] = ["flow"]
d["flow"].append("wolf")

如果这是您要执行的操作，则可能要使用

If that is what you want to do, then you might want to use defaultdict. Then you can do

from collections import defaultdict
d = defaultdict(list)
d["flow"].append("flow")
d["flow"].append("wolf")